Two years ago, Prime Minister David Cameron gave the Office for National Statistics the green light to begin a new programme for Measuring National Well-Being . A key part of the programme was to begin to collect subjective well-being data on a scale never before seen. The decision transformed debate on subjective well-being around the world, from whether it should be measured to how it should be measured and, ultimately, what we should do with the data when we have it. Having advocated the measurement of well-being since 2006, November 2010 was a hugely satisfying personal landmark.